Core Balance Current Transformer (CBCT) or Zero Sequence CT (ZCT)

CBCTs in Medium-Voltage Systems

A Core Balance Current Transformer (CBCT), also known as a Zero Sequence CT (ZCT), is a specialized electrical device designed to detect unbalanced currents in a three-phase system. It primarily serves as a safety device to prevent electrical faults and ensure system integrity. By monitoring the current flow in each phase, the CBCT can identify abnormal conditions, such as earth faults or short circuits, and initiate protective measures. This essential component is widely used in various industries, including power generation, transmission, and distribution, to safeguard equipment and personnel from electrical hazards.

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Zero Sequence Current Detection: CBCTs detect unbalanced currents in three-phase systems.
Wide Application Range: CBCTs are essential for protecting critical equipment in various industries.
High sensitivity: CBCTs detect even small imbalances.
Compact Design: CBCTs are compact and easy to install.

Features:

Selection of CBCT or ZCT

Nominal CT ratio: This should be set so that, even in the case of a minor ground fault, there is enough current to run an earth fault relay.
Main ground leakage current at a minimum
Relay operating voltage requires a minimum excitation current.
The CT’s dimensions and internal diameter (internal diameter depends on the size of the cable)
The voltage at the knee

Stats & Charts

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Questions? You’re covered

CBCT’s FAQs

01. What is the primary function of a CBCT?

A CBCT is primarily used to detect and protect against earth faults in three-phase electrical systems.

02. How does a CBCT work based on Kirchhoff's current law?

Under normal conditions, the vector sum of phase currents in a balanced three-phase system is zero. This means no zero sequence current flows, and the CBCT remains inactive. However, during a fault, the imbalance causes a zero sequence current to flow, activating the CBCT and triggering a protective action.

03. In what industries or applications are CBCTs commonly used?

CBCTs are widely used in power generation, transmission, distribution, and industrial facilities to protect motors and other critical equipment from earth faults.